Blow-off cock.



C. HOBBS & J. C. RAE.

BLOW-OFF COCK.

APPLICATION FILED APR- 5. 19H).

1 1 60,285 Patented Nov. 16, 1915.

COLUMBIA PLANOGRAPH C(LIWASHINOTON, D. c.

States of .America, the county of Shiawassee and State of :Michigan,

(CLEMENT Horns-AND. Joniv c. RAE, 0F :owosso, inmate-AN.

' .zenow-orr 000K.

i-Specification of Letters Patent.

Patented Nov.1fi,1915.

hpplicatienifi-ld April $19155; SSeriakNo. 1193125.

' for boilers, and'the principal object is to provide simple and effective means, in a manner as hereinafter set forth for shutting off boiler pressure fromw anoperating valve in order that the valve can be quickly repaired, without removing water "from a boiler, said means preventing a boilerfai'lure should foreign matter become lodged in the operating valve.

Another object of this invention is to combine an emergency valve with an operating valve to form a novel blow-off cook, the emergency valve permitting of the operating valve being removed for cleansing or repair purposes while steam pressure 1s maintained in a boiler.

A further object of this invention is to accomplish the above result by a simple, durable and inexpensive mechanical construction that will be hereinafter specifically described and then claimed, and reference will now be had to the drawing wherein there is illustrated a vertical sectional view of a blow-01$ cock in accordance with this invention.

A blow-off cock in accordance with our invention comprises an elbow 1 which is vertically disposed and has the upper end thereof closed by a top plate 2 provided with a central inlet port 3 surrounded by a valve seat 4. Slidable in the inlet port 3 are the wings 5 of a valve 6 normally enaging the seat 1, said valve having a stem 5 extending through the bottom of the elhow 1 and adapted to be actuated by an operating lever 8, pivotally connected, as at 9 to the outlet end of the elbow 1. Any suitable means can be employed for moving the operating lever 8 and said lever is adapted to unseat the valve 6 to admit steam or fluid to the elbow 1 to exhaust to the atmosphere.

The valve seat 4 is partially formed in an annular raised portion 10 on the top plate 2 and this raised portion centers an emergency valve body 11 upon the top plate, whereby thetemergency .valvevcan be suitably connected to sard plate to cooperate with valve 6 constitutingan operating valve.

The valve body .11 has a connection 12 adapted tocommunicatewitha-boiler to receive steam under: pressure and=within the valve body 11- is a horizontally disposed par- :tition113 provided with a port 1st and a valve seat 15. Thepartition 13 is spaced from the Elower end: of'the valvebody 11to cooperate with the top plate 2- of the operating valve forming a chamber 16,:which provides clearance for the valve (3 :as the same is :ralsed from 1ts seat.

The upper: end of the valve body ll has a conventional form of cap 17 and a stuffing boX 18 for a rotatable valve stem 19, said stem having the upper end thereof provided with an ordinary hand wheel 20 and the lower end thereof with a valve 21 free to revolve relative to the stem 19 and adapted to engage the seat 15 of the partition 13.

The combined valves can be easily and quickly installed in connection with a boiler and in operation the valve 21 is normally unseated, whereby the operating valve can be opened from time to time to reduce boiler pressure. Should the operating valve be impaired by foreign matter lodging upon the seat 4 or should the valve 6 need regrinding, the emergency valve 21 is closed, thereby shutting off the boiler pressure of steam to the operating valve and it is possible to disconnect the elbow 1 whereby easy access is had to the valve 6. After the valve has been repaired or renewed and again connected to the emergency valve said valve can be opened and the blow-off cock is ready for use.

We attach considerable importance to the fact that the combined valves provide a unitary structure and that the operating valve as shown cannot be used without the emergency valve and vice versa. Throughout the construction of the blow-0E cook the parts are assembled to insure accuracy of operation and easy access for repair purposes, and. while in the drawing there is illustrated a valve as actually constructed and used, we desire it to be understood that the structural elements are susceptible to such changes as fall within the scope of the appended claims.

What we claim is:-

1. A blow-off cock comprising an elbow having a top plate provided with a valve seat, a valve body connected to the top plate of said elbow and having an inlet in a di-,

rection opposite the outlet of said elbow, a

valve seat in said valve body in alinement with the valve seat of the top plate of said elbow and providing a chamber above the valve seat of said top plate, a valve in said valve body movable to and from the seat" thereof, a valve normally on the valve seat of said top plate and having wings adapted to guide said Valve into the chamber between 7 said valve seats, and means below said elbow adapted to facilitate moving said valve.

2. A blow-off cock comprising an elbow having an end thereof provided with a valve seat, an emergency valve connected to the same end of said elbow and providing a chamber above the valve seat of said elbow with an inlet connection in an opposite direction from the outlet of said elbow, a valve in the longitudinal axis of said emergency valve normally on the seat of said elbow, and means below said elbow adapted to facilitate unseating said valve.

3. A blow-0E cock comprising an elbow having a top plate provided with a valve seat, an emergency Valve body connected to the top plate of said elbow and having a connection at right angles to the longitudinal aXis of said valve body and in a direction opposite that ,of the outlet of said elbow and adapted for communication with a boiler to receive steam therefrom, a valve carried by said emergency valve body and movable In testimony whereof we 'aflix our signatures in presence of-two witnesses.

CLEMENT HOBBS. JOHN G. RAE. Witnesses:

SETH Q. PULVER, JOHN J. BROWN.

Copies ofthis patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

